Private key stored by egnkey in private_key_hex.txt even if it's not hexadecimal

[MegaRedHand]

Describe the bug

The private keys generated are stored inside a private_key_hex.txt file. This is a misnomer because the BLS keys are stored in decimal (yet the ECDSA keys are stored in hexadecimal).

To Reproduce

Run:

egnkey generate --key-type bls --num-keys 1
cat bls-*/private_key_hex.txt

Expected behavior

Because of the filename, I expected the private key to be in hexadecimal.